Update with some more screenshots.
Issue seems to happen 99%+ of times starting Minecraft now.
With exception of a single time where error didn't show and resource pack was loaded at start screen, rest of starts of Minecraft (and there have been a lot) result in resource pack(s) being deactivated.
I've tried several resource packs with same result - ex.
[media][media]Whenever issue occurs, simply going into settings and exiting (pressing circle) results in loading of the packs previously activated
[media]
Reviewing the packs immediately after deactivation message is displayed shows all packs present under "My Packs" (or under Active when they are activated)
[media]Clarification edit: all packs shown here under My Packs since I deactivated the pack (Texture Update Beta Pack in this case) to show that all packs are in-fact present.
Also happening on 1.18.30 PS4